Considering Github Enterprise (which offers on-prem) is their main feature, and main source of revenue (paying for the free stuff) it's really unlikely.
Why not just use Gitlab if you really need on-prem for cheap/free?
>>tracke+(OP)
Heh, well, there you go - it's exactly why we are using Gitlab. It's going to be a pressure point for them just lke the free private repos has been previously.